I am not sure who developed that. I amsomeone who does everything by hand and writes it all down to keep track of it for taxes and in case my computer crashes. I developed the QUICK AIM CALCULATOR just to figure out the hold zone so I could. Just glan e at an index card instead of doing EVERY calculation EVERY month.
I have a piece of paper with columns horizontally
PC CASH # SHARES
THE ABOVE IS FILLED OUT AFTER EACH TRADE THE NEXT COLUMNS ARE ONLY FILLED OUT IF I HAVE A TRADE
DATE of trade ( in column one before PC) STOCK PRICE STOCK VALUE BUY ( SELL ) DOLLAR AMOUNT # SHARES TO BUY OR ( SELL )